Hanwha Chemical Corporation

Hanwha Solutions Corporation

Hyun Cheol Ryu

Dong Ho Lee

Gui Ryong Ahn

Kee Do Han

Yong Hwa Lee

Seong Ho Park

Deoc Hwan Hyun

Jae Eock Cho

Chang Mo Chung

Gang Ii Kim

The present invention relates to a toluene diisocyanate purification method enabling acquisition of a product having a small amount of dimers in a final product by means of using a reactive dividing wall column during toluene diisocyanate preparation. More particularly, according to the present invention, in order to obtain a product having a small amount of dimers in accordance with a reversible reaction of a monomer and a dimer, a purification procedure is designed by means of applying the temperature, pressure, time of stay and the like of a reactive dividing wall column as appropriate particular conditions, a reboiler having short time of stay and high heat transfer rate is used, and thus a dimerization reaction is inhibited and the purity and yield of the product are enhanced. Therefore, high-purity toluene diisocyanate can be purified and obtained.

Toluene diisocyanate purification method

Provided is a method of manufacturing a solar cell, wherein a solar cell is manufactured by combining a damage removal etching process, a texturing process and an edge isolation process. The method is advantageous in that RIE and DRE are conducted, and then DRE/PSG and/or an edge isolation removal process are simultaneously conducted, so that the movement of a substrate (that is, a wafer) is minimized, thereby reducing the damage rate of the substrate.

Method for manufacturing solar cell

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Daejeon, South Korea

Hyun Cheol Ryu